Cyanotype process - Possible confusion
Cyanotypes are not the only blue prints. Other possibilities include:
- Photomechanical reproductions in blue inks,
- Blue-toned silver gelatine prints
- Carbon prints using blue pigments
- Gum bichromate prints using blue pigments
- are always matt surfaced.
- The image is clearly in the paper fibres, not on a layer on top of the paper.
- The colour is a pure blue or greenish blue